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Diffstat (limited to 'doc/development/profiling.md')
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diff --git a/doc/development/profiling.md b/doc/development/profiling.md index 316273f37b8..04713055117 100644 --- a/doc/development/profiling.md +++ b/doc/development/profiling.md @@ -120,3 +120,16 @@ Bullet will log query problems to both the Rails log as well as the Chrome console. As a follow up to finding `N+1` queries with Bullet, consider writing a [QueryRecoder test](query_recorder.md) to prevent a regression. + +## Settings that impact performance + +1. `development` environment by default works with hot-reloading enabled, this makes Rails to check file changes every request, and create a potential contention lock, as hot reload is single threaded. +1. `development` environment can load code lazily once the request is fired which results in first request to always be slow. + +To disable those features for profiling/benchmarking set the `RAILS_PROFILE` environment variable to `true` before starting GitLab. For example when using GDK: + +- create a file [`env.runit`](https://gitlab.com/gitlab-org/gitlab-development-kit/-/blob/master/doc/runit.md#modifying-environment-configuration-for-services) in the root GDK directory +- add `export RAILS_PROFILE=true` to your `env.runit` file +- restart GDK with `gdk restart` + +*This environment variable is only applicable for the development mode.* |